FILE - In this Jan. 11, 2020, file photo, protesters hold flowers as tear gas fired by police rises at a demonstration in front of Amir Kabir University in Tehran, Iran, to remember victims of a Ukrainian airplane shot down by an Iranian missile. The downing of a Ukrainian jetliner near Tehran on Jan. 8 highlights the limits of the civilian arm of Iran's government against the absolute power of the Shiite theocracy and the paramilitary forces beneath it. (AP Photo/File)